PROBLEM TO BE SOLVED: To provide a magnetic sensor capable of improving detection sensitivity, a magnetic sensor device, and a diagnosis device.SOLUTION: According to an embodiment, a magnetic sensor comprises: a first electrode a second electrode a first magnetic effect element in which an intermediate layer is provided between a first magnetic layer and a second magnetic layer along a first direction and which is provided between the first electrode and the second electrode along a second direction a current applying unit which is connected to the first electrode and the second electrode and can apply AC current and a detecting unit which detects the AC signal output from the first magnetic effect element. A length in the second direction of the first magnetic effect element is longer than a length in a third direction orthogonal to the first direction and the second direction.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】検出感度の向上が可能な磁気センサ、磁気センサ装置、診断装置を提供する。【解決手段】実施形態によれば、磁気センサは第1電極と、第2電極と、第1方向に沿って第1磁性層と第2磁性層の間に中間層が設けられ、第2方向に沿って前記第1電極と前記第2電極の間に設けられた第1磁気効果素子と、前記第1電極および前記第2電極に接続し、交流電流を印加可能な電流印加部と、前記第1磁気効果素子から出力された交流信号を検出する検出部と、を備える。前記第1磁気効果素子の第2方向の長さは前記第1方向および前記第2方向に直交する第3方向の長さより長い。【選択図】図1
